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450=(18-x)(20-2x)(x)
We move all terms to the left:
450-((18-x)(20-2x)(x))=0
We add all the numbers together, and all the variables
-((-1x+18)(-2x+20)x)+450=0
We multiply parentheses ..
-((+2x^2-20x-36x+360)x)+450=0
We calculate terms in parentheses: -((+2x^2-20x-36x+360)x), so:
(+2x^2-20x-36x+360)x
We multiply parentheses
2x^3-20x^2-36x^2+360x
We do not support expression: x^3
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